Chemistry Test 87

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Chemistry Test 87

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Weekly Quiz Competition

Question 1
4 / -1

What is the shortest wavelength for Paschen series of Li²⁺ ion :-

A
R/9

B
9/R

C
1/R

D
9R/4

Solution
Question 2
4 / -1

What will be the longest wavelength in Blamer series in hydrogen spectrum ?

A
546 nm

B
656 nm

C
566 nm

D
556 nm

Solution
Question 3
4 / -1

If electron falls from n = 3 to n = 2, then emitted energy is :- (for H atom)

A
10.2 eV

B
12.09 eV

C
1.9 eV

D
0.65 eV
Question 4
4 / -1

The de-Broglie wavelength associated with a ball of mass 1 kg having KE 0.5 J is :-

A
6.626 × 10^–34 m

B
6.626 × 10^–32 cm

C
6.626 × 10^–34 Å

D
Both (1) and (2)
Question 5
4 / -1

Six protons are found in the nucleus of :-

A
Boron

B
Lithium

C
Carbon

D
Helium
Question 6
4 / -1

What is the energy content per photon (J) for light of frequency 4.2 × 10¹⁴ ?

A
27.8 × 10^–21

B
2.5 × 10^–19

C
27.8 × 10^–20

D
2.5 × 10^–18
Question 7
4 / -1

The H-spectrum shows

A
Heisenberg's uncertainity principle

B
Scattering of light

C
diffraction of light

D
Presence of quantised energy levels
Question 8
4 / -1

In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainty with which the position of the electron can be located is (h = 6.6 × 10^–34 kg m²s^–1, mass of electron, e_m = 9.1 × 10^–31 kg) :-

A
1.52 × 10^–4 m

B
5.10 × 10^–3 m

C
1.92 × 10^–3 m

D
3.84 × 10^–3 m
Question 9
4 / -1

Two electrons present in M shell will not differ in:-

A
Principal quantum number

B
Azimuthal quantum number

C
Magnetic quantum number

D
Spin quantum number
Question 10
4 / -1

Which of the following is not a correct statement regarding the energies of orbitals ?

A
The lower the value of (n + ℓ) for an orbital, lower is its energy.

B
Energies of the orbitals in the same subshell decreases with increase in atomic number

C
Energy of s-orbital is lower than p-orbital and energy of p-orbital is less than that of d-orbital

D
If two orbitals have same value for (n + ℓ) then the orbital with higher value of n will have lower energy.

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Chemistry Test 87

Result

Chemistry Test 87

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Rank

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SHARING IS CARING

Question 1

R/9

9/R

1/R

9R/4

Solution

Question 2

546 nm

656 nm

566 nm

556 nm

Solution

Question 3

10.2 eV

12.09 eV

1.9 eV

0.65 eV

Question 4

6.626 × 10–34 m

6.626 × 10–32 cm

6.626 × 10–34 Å

Both (1) and (2)

Question 5

Boron

Lithium

Carbon

Helium

Question 6

27.8 × 10–21

2.5 × 10–19

27.8 × 10–20

2.5 × 10–18

Question 7

Heisenberg's uncertainity principle

Scattering of light

diffraction of light

Presence of quantised energy levels

Question 8

1.52 × 10–4 m

5.10 × 10–3 m

1.92 × 10–3 m

3.84 × 10–3 m

Question 9

Principal quantum number

Azimuthal quantum number

Magnetic quantum number

Spin quantum number

Question 10

The lower the value of (n + ℓ) for an orbital, lower is its energy.

Energies of the orbitals in the same subshell decreases with increase in atomic number

Energy of s-orbital is lower than p-orbital and energy of p-orbital is less than that of d-orbital

If two orbitals have same value for (n + ℓ) then the orbital with higher value of n will have lower energy.

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6.626 × 10^–34 m

6.626 × 10^–32 cm

6.626 × 10^–34 Å

27.8 × 10^–21

2.5 × 10^–19

27.8 × 10^–20

2.5 × 10^–18

1.52 × 10^–4 m

5.10 × 10^–3 m

1.92 × 10^–3 m

3.84 × 10^–3 m